#define INV_M_PI 0.3183098862
#define M_PI 3.1415926536
#define M_INV_LOG2 1.4426950408889
#define M_2_PI (2.0*3.1415926536)
#define M_HALF_PI (0.5*3.1415926536)
#define GOLDEN_RATIO 1.61803398874989
#define GOLDEN_ANGLE 2.39996322972865332
